What I Know
A. Complete the sentences with can (cannot) or could (could not).
1. Betty _______ ride a bicycle. She rides on it to school everyday.
2. I'm very tired, so I _____ go out to the park to play.
3. ________ medical experts discover a vaccine for COVID-19 this year?
4. When _________ I talk to you about the book report?
5. Most dinosaurs walked on land, but some _______ fly or even swim.
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Answer:
1. can 2. cannot 3. Could 4.can 5.can